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sanctified
sanctified
Associate III
Dec 9, 2020 3:16 PM UTC
Solved

ADC(VDDA) Input Volatge

Hi,

I am not quite sure about this.

I have a STM32L100 µC operating at 1.8V, the analog pin sees a 3.0V coming from a battery and I want to use the ADC to be able to monitor the voltage of the battery.

I plan to supply the VDDA Pin with 3.3V (the VRef+ is internally connected to VDDA).

My question: Is this allowed. Can I give the VDDA a different voltage than what the µC is operating with?

I read the datasheet but i did not quite see the relation between VDD and VDDA.

This topic has been closed for replies.
TDK
TDKBest answer
Dec 9, 2020 5:51 PM UTC

VDDA needs to be connected to VDD. It's in the datasheet.

0693W000006FCiJQAW.png

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3 replies

Tesla DeLorean
Tesla DeLorean
Guru
Dec 9, 2020 3:41 PM UTC

Not a part I'm using, but other STM32 don't permit significant difference in VDD/VDDA

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TDK
TDKBest answer
Dec 9, 2020 5:51 PM UTC

VDDA needs to be connected to VDD. It's in the datasheet.

0693W000006FCiJQAW.png

"If you feel a post has answered your question, please click ""Accept as Solution""."
sanctified
sanctifiedAuthor
Associate III
Dec 10, 2020 11:07 AM UTC

Okay. Thanks for your replies

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